Lexus ES: Lost Communication With ECM/PCM "A" Missing Message (U010087,U012987,U014087,U016487,U029387,U115187)
DESCRIPTION
These DTCs are stored when a malfunction occurs in the CAN communication circuit.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| U010087 | Lost Communication With ECM/PCM "A" Missing Message | Stereo component equalizer assembly detects CAN communication malfunction in engine system for 1 second or more continuously, 3 seconds or more after power switch is turned on (IG)* | CAN communication system |
| U012987 | Lost Communication With Brake System Control Module Missing Message | Stereo component equalizer assembly detects CAN communication malfunction in brake system for 1 second or more continuously, 3 seconds or more after power switch is turned on (IG)* | CAN communication system |
| U014087 | Lost Communication with Body Control Module Missing Message | Stereo component equalizer assembly detects CAN communication malfunction in main body ECU for 3 seconds or more continuously, 3 seconds or more after power switch is turned on (IG)* | CAN communication system |
| U016487 | Lost Communication with HVAC Control Module Missing Message | Stereo component equalizer assembly detects CAN communication malfunction in the air conditioning system for 25 seconds or more continuously 3 seconds after the power switch is turned on (IG)* | CAN communication system |
| U029387 | Lost Communication With Hybrid Powertrain Control Module Missing Message | Stereo component equalizer assembly detects CAN communication malfunction in the HV system for 1 second or more continuously 3 seconds after the power switch is turned on (IG)* | CAN communication system |
| U115187 | Lost Communication with Hybrid Powertrain Control Module (C-Bus) Missing Message | Stereo component equalizer assembly detects CAN communication malfunction in the HV system (chassis bus) for 6 second or more continuously 3 seconds after the power switch is turned on (IG)* | CAN communication system |
HINT:
*: Malfunction monitoring is not performed under the following conditions, in order to prevent erroneous detection.
- After power switch is turned on (ACC) for 3 seconds or more.
- After the auxiliary battery voltage returns to normal for 3 seconds.
- Before 3 seconds have elapsed after auxiliary battery voltage has returned to normal.
PROCEDURE
| 1. | CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Active Noise Control > Clear DTCs
|
| 2. | CHECK FOR DTC |
(a) Check for DTCs with all of the detection conditions met.
Body Electrical > Active Noise Control > Trouble CodesOK:
No DTCs are output.
HINT:
- If CAN communication system malfunction DTCs are output, they may also be output for other systems.
- If the CAN communication system has been checked and repaired in other systems, the DTC will not be output after rechecking for DTCs.
-
If the DTC is output frequently, duplicate the conditions that cause a malfunction and perform the check again, even though the DTC was not output after rechecking for DTCs.
Click here
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| OK |  | USE SIMULATION METHOD TO CHECK |
| NG | | GO TO CAN COMMUNICATION SYSTEM |
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Components
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Installation
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System Description
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